<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <p v-for="(todo,index) in todos" :key="index">
            {{todo.text}}--{{index}}
        </p>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
        var app = new Vue({
            el:'#app',
            data () {
                return {
                    todos:[
                        {text:'测试1'},
                        {text:'测试2'},
                        {text:'测试3'},
                    ]
                }
            }
        })
    </script>
</body>
</html>